CN101912968A - Suspension sintering method of slender powder metallurgy tube/bar blank - Google Patents
Suspension sintering method of slender powder metallurgy tube/bar blank Download PDFInfo
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- CN101912968A CN101912968A CN 201010259586 CN201010259586A CN101912968A CN 101912968 A CN101912968 A CN 101912968A CN 201010259586 CN201010259586 CN 201010259586 CN 201010259586 A CN201010259586 A CN 201010259586A CN 101912968 A CN101912968 A CN 101912968A
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Abstract
The invention discloses a suspension sintering method of a slender powder metallurgy tube/bar blank, which comprises the following steps: 1, vertical suspension: suspending and fixing one end of the slender powder metallurgy tube/bar blank to be sintered on a fixed supporting structure arranged in a high-temperature sintering furnace, and allowing the slender powder metallurgy tube/bar blank to vertically suspended on the fixed supporting structure under the action of self gravity; and 2, high-temperature sintering: sintering the vertically-suspended slender powder metallurgy tube/bar blank to be sintered at a high temperature in the high-temperature sintering furnace, wherein in a high-temperature sintering process, the slender powder metallurgy tube/bar blank to be sintered is suspended vertically in the high-temperature sintering process all the time. In the invention, the design is reasonable, the operation is simple and convenient, the investment cost is low, the realization is convenient, the using effect is desirable, the rate of sintered powder metallurgy tubes/bars is high, problems of breakage, bending deformation, surface pollution and the like which are likely to happen In a sintering process of the slender powder metallurgy tube/bar blank are solved, and an effect of automatically leveling the sintered blank is achieved.
Description
Technical field
The invention belongs to metal body heat treatment technics field, especially relate to the suspension sintering method of a kind of slender powder metallurgy tube pipe/excellent base substrate.
Background technology
So-called slender powder metallurgy tube pipe/excellent base substrate refers generally to external diameter or equivalent diameter less than 30mm, and tubular blank or the bar-shaped blank of draw ratio (ratio of length and external diameter) greater than 10.The sintering method of powder metallurgy blank is divided into filler sintering and two kinds of methods of filler-less sintering, and used dress boat mode has vertical and horizontal other.Actual when carrying out sintering, for guarantee pressed compact be heated evenly when the sintering, indeformable,, length powder metallurgy pressed compact that length, thinner thickness, tubulose and compact strength low comparatively complicated for shape, generally all adopt Packed sintering processing, this kind have the filler sintering method be sintered the powder metallurgy base substrate around or middle fill suitable filler, make its shape that keeps base substrate in high-temperature sintering process, used sintering filler is generally fused alumina, electrically molten magnesia sand, high-purity zirconia sand etc.
Nowadays, adopt vertical dress boat and filling filler sintering method (hereinafter to be referred as " vertical loading method ") to guarantee the perpendicularity and the circularity of sintering for the bigger tubulose of shaping of metal powders and draw ratio or the sintering process of bar-shaped base substrate.But, also there is following shortcoming in above-mentioned sintering method: 1. for elongated pipe or excellent base, when adopting vertical loading method to carry out sintering, because granular filler is different with the thermal coefficient of expansion of base substrate, then make low intensive base substrate produce the thermal stress inequality easily, cause that product cracks, the phenomenon of crooked even fracture in sintering process; 2. fill when burning boat for the filler that adopts fine particle, institute's filler that adopts uses in vacuum drying oven and will cause fine powder to fly upward, and the pollution burner hearth influences equipment life; When 3. adding the filler sintering, the organic volatile that is sintered in the base substrate is not easy volatilization and eliminating, particularly in hydrogen atmosphere during sintering, the volatile matter in elongated pipe or the excellent base is difficult to be taken out of stove, then causes easily to be sintered base substrate and surface contamination to occur, form shortcoming such as spot; 4. under the impure situation of filler, the impurity in the filler will pollute powder metallurgy pipe or the excellent base that is sintered.
Summary of the invention
Technical problem to be solved by this invention is at above-mentioned deficiency of the prior art, the suspension sintering method of a kind of slender powder metallurgy tube pipe/excellent base substrate is provided, it is reasonable in design, easy and simple to handle, input cost is low, realization is convenient and result of use is good, the yield rate height of the powder metallurgy pipe/rod of institute's sintering, can effectively solve problems such as incident fracture in long and thin metal powder metallurgy pipe/bar-shaped blank sintering process, flexural deformation, surface contamination, and have the effect of aligning sintered blank voluntarily.
For solving the problems of the technologies described above, the technical solution used in the present invention is: the suspension sintering method of a kind of slender powder metallurgy tube pipe/excellent base substrate is characterized in that this method may further comprise the steps:
The suspension sintering method of above-mentioned a kind of slender powder metallurgy tube pipe/excellent base substrate, it is characterized in that: the suspended end of the described slender powder metallurgy tube pipe to be sintered of step 1/excellent base substrate hangs by the suspension silk made by refractory metal silk material and is fixed on the described fixed support structure, and the described silk that hangs is for adopting the metal wire material of high temperature sintering furnace to the high temperature sintering temperature of slender powder metallurgy tube pipe to be sintered/when excellent base substrate carries out high temperature sintering in the ability step 2; Corresponding being provided with on the suspended end of slender powder metallurgy tube pipe to be sintered/excellent base substrate for hanging hanging hole or the hanging groove that silk hangs.
The suspension sintering method of above-mentioned a kind of slender powder metallurgy tube pipe/excellent base substrate, it is characterized in that: described fixed support structure is for burning boat, bin or being laid in the interior support bar of described high temperature sintering furnace, and described support bar is made by the high temperature alloy of the high temperature sintering temperature in the described high temperature sintering furnace of ability.
The suspension sintering method of above-mentioned a kind of slender powder metallurgy tube pipe/excellent base substrate, it is characterized in that: the suspended end with slender powder metallurgy tube pipe to be sintered/excellent base substrate described in the step 1 hangs and is fixed on before the described fixed support structure, carries out earlier perforate or fluting and corresponding formation hanging hole or hanging groove on described suspended end; And when being fixed on described suspended end suspension on the described fixed support structure, to hang earlier in silk peg hole or the hanging groove and pass, the two ends that will hang silk again are fixed together and form the hanging ring of a sealing, after afterwards a horizontal peg being passed in described suspension, more horizontal peg is suspended on the described fixed support structure together with the slender powder metallurgy tube pipe to be sintered/excellent base substrate that hangs thereon; Described horizontal peg horizontal fixed is installed on the described fixed support structure.
The suspension sintering method of above-mentioned a kind of slender powder metallurgy tube pipe/excellent base substrate, it is characterized in that: described hanging hole is a circular hole, the diameter of described circular hole is 1/5～1/2 of slender powder metallurgy tube pipe to be sintered/excellent base substrate external diameter or an equivalent diameter, distance between the center of circle of described circular hole and the described suspended end end is 2mm～10mm, and the diameter of described suspension silk is less than the diameter of described circular hole; Described hanging groove is a square groove, the length of side of described square groove is 1/6～1/3 of slender powder metallurgy tube pipe to be sintered/excellent base substrate external diameter or an equivalent diameter, distance between the central axis of described square groove and the described suspended end end is 3mm～8mm, and the diameter of described suspension silk is less than the length of side of described square groove.
The suspension sintering method of above-mentioned a kind of slender powder metallurgy tube pipe/excellent base substrate is characterized in that: the metal pipe described in the step 1 is a circular pipe blank.
The suspension sintering method of above-mentioned a kind of slender powder metallurgy tube pipe/excellent base substrate is characterized in that: the metal bar base described in the step 1 is that cross section is circular or square pole base or square rod base.
The present invention compared with prior art has the following advantages:
1, reasonable in design, input cost is low and realize convenient, is easy to control.
2, easy and simple to handle, one end that will have certain intensity or the pre-powder metallurgy elongated tubular/excellent base substrate tied of process is as suspended end, on suspended end, adopt means such as punching, cutting that it is hung, fix, put into sintering furnace and carry out sintering by burning boat or other supports.In general, be punch in suspended end (being called hanging hole) for powder metallurgy pipe hang, the sintering that dangles then, hanging hole diameter generally are 1/5～1/2 of pressed compact diameters, the centre distance suspended end is in 2～10mm scope; For the powder metallurgy rod, can adopt the mode of cutting (hanging groove) or punching to realize the sintering that dangles, the hanging groove cross section is a square, the length of side is 1/4～1/3 of a pressed compact diameter, is 3～8mm apart from suspended end.After the suspension silk passes hanging hole, form closed loop, peg is passed hang the silk closed loop then its sintering that dangles.For the suspension of hanging groove, need be with the knotting of suspension silk one end, the other end passes knot back, hole and beat same knot on the suspension silk, makes it form the closed loop that can strain, and powder metallurgy pipe/bar-shaped base substrate is placed in the closed loop and strains, and hangs sintering then.
3, result of use is good and practical value is high, and an end of powder metallurgy pipe/bar-shaped base substrate is formed hanging hole or hanging groove by methods such as punching or cuttings, makes it form suspended end, and the other end is a free end, it is hung carries out sintering by hanging silk; When dangling sintering, do not need to fill filler, high temperature is down because gravitation energy is aligned elongated tubular/rod voluntarily, the filler of having avoided the conventional sintering method to exist pollutes sintered surface and surface crater, elongated tubular/excellent flexural deformation even fracture, thereby effectively improved the sintering finished rate of the big elongated tubular/rod of draw ratio, be of very high actual application value.
4, the yield rate height of the powder metallurgy pipe/rod of institute's sintering, because the present invention does not have the direct contact material of filler with powder metallurgy pipe/bar-shaped base substrate in sintering process, thereby can guarantee that material is not contaminated, realize clean pollution-free sintering, simultaneously can realize aligning voluntarily, guarantee that material is not crooked, indeformable and do not have pit.
In sum, the present invention is reasonable in design, easy and simple to handle, input cost is low, realization is convenient and result of use is good, the yield rate height of the powder metallurgy pipe/rod of institute's sintering, can effectively solve problems such as incident fracture in long and thin metal powder metallurgy pipe/bar-shaped blank sintering process, flexural deformation, surface contamination, and have the effect of aligning sintered blank voluntarily.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 carries out the user mode reference diagram of vertical hanging to slender powder metallurgy tube pipe to be sintered/excellent base substrate for the present invention.
Structural representation when Fig. 2 adopts hanging hole that circular pipe blank is carried out vertical hanging for the present invention.
Structural representation when Fig. 3 adopts hanging groove that circular pipe blank is carried out vertical hanging for the present invention.
Description of reference numerals:
The horizontal peg of 1-; 2-hangs silk; The 3-1-hanging hole;
The 3-2-hanging groove; The 4-bin; The 5-circular pipe blank;
6-pole base.
The specific embodiment
The suspension sintering method of a kind of slender powder metallurgy tube pipe of the present invention/excellent base substrate may further comprise the steps:
In the actual mechanical process, the suspended end of described slender powder metallurgy tube pipe to be sintered/excellent base substrate hangs by the suspension silk of being made by refractory metal silk material 2 and is fixed on the described fixed support structure; Corresponding being provided with on the suspended end of slender powder metallurgy tube pipe to be sintered/excellent base substrate for hanging hanging hole 3-1 or the hanging groove 3-2 that silk 2 hangs.Described fixed support structure is for burning boat, bin 4 or being laid in the interior support bar of described high temperature sintering furnace, and described support bar is made by the high temperature alloy of the high temperature sintering temperature in the described high temperature sintering furnace of ability.During actual suspension, also can select for use other suspended end of slender powder metallurgy tube pipe to be sintered/excellent base substrate can be fixedly secured fixed form on described fixed support structure, the suspended end that only need guarantee slender powder metallurgy tube pipe to be sintered/excellent base substrate can fixedly secure in high-temperature sintering process all the time on described fixed support structure and its other end is a free end, in the whole high-temperature sintering process, slender powder metallurgy tube pipe to be sintered/excellent base substrate is the vertical hanging state all the time.
Wherein, slender powder metallurgy tube pipe to be sintered/excellent base substrate is the tubulose base substrate or the bar-shaped base substrate of metal dust moulding, perhaps needs sintering or heat treated slender metal pipe or elongated metallic bars, and this base substrate has certain intensity, can carry out vertical hanging.
In conjunction with Fig. 1, in the actual suspension process, the suspended end of slender powder metallurgy tube pipe to be sintered/excellent base substrate hung be fixed on before the described fixed support structure, on described suspended end, carry out earlier perforate or fluting and corresponding formation hanging hole 3-1 or hanging groove 3-2; And when being fixed on described suspended end suspension on the described fixed support structure, to hang earlier among silk 2 peg hole 3-1 or the hanging groove 3-2 and pass, to hang the hanging ring that silk 2 two ends are fixed together and form a sealing again, after afterwards a horizontal peg 1 being passed in described suspension, more horizontal peg 1 is suspended on the described fixed support structure together with the slender powder metallurgy tube pipe to be sintered/excellent base substrate that hangs thereon.Described horizontal peg 1 horizontal fixed is installed on the described fixed support structure.Described burning boat, bin 4 and horizontal peg 1 are made by the high temperature alloy of the high temperature sintering temperature in the described high temperature sintering furnace of ability.
Described hanging hole 3-1 is a circular hole, the diameter of described circular hole is 1/5～1/2 of slender powder metallurgy tube pipe to be sintered/excellent base substrate external diameter or an equivalent diameter, distance between the center of circle of described circular hole and the described suspended end end is 2mm～10mm, and the diameter of described suspension silk 2 is less than the diameter of described circular hole.Described hanging groove 3-2 is a square groove, the length of side of described square groove is 1/6～1/3 of slender powder metallurgy tube pipe to be sintered/excellent base substrate external diameter or an equivalent diameter, distance between the central axis of described square groove and the described suspended end end is 3mm～8mm, and the diameter of described suspension silk 2 is less than the length of side of described square groove.Among Fig. 1, slender powder metallurgy tube pipe to be sintered/excellent base substrate is that metal bar base and described metal bar base are that cross section is circular pole base 6.
To sum up, when reality is determined the size of hanging hole 3-1 and hanging groove 3-2, should calculate definite according to slender powder metallurgy tube pipe to be sintered/excellent base substrate external diameter or equivalent diameter: when the cross section of slender powder metallurgy tube pipe to be sintered/excellent base substrate when circular or circular, then the external diameter with slender powder metallurgy tube pipe to be sintered/excellent base substrate serves as according to calculating definite to the size of hanging hole 3-1 and hanging groove 3-2; When the cross section of slender powder metallurgy tube pipe to be sintered/excellent base substrate is other shape outside circular and circular, then should be earlier according to the equivalent diameter computing formula of this shape correspondence calculate slender powder metallurgy tube pipe to be sintered/excellent base substrate equivalent diameter, the equivalent diameter with slender powder metallurgy tube pipe to be sintered/excellent base substrate of calculating serves as according to calculating definite to the size of hanging hole 3-1 and hanging groove 3-2 again.For example, rectangular equivalent diameter
Wherein a, b are respectively rectangular length and wide; Foursquare equivalent diameter is
Wherein c is the foursquare length of side.
Above-mentioned suspension silk 2 is for adopting the metal wire material of high temperature sintering furnace to the high temperature sintering temperature of slender powder metallurgy tube pipe to be sintered/when excellent base substrate carries out high temperature sintering in the ability step 2.
In conjunction with Fig. 1, in the present embodiment, slender powder metallurgy tube pipe to be sintered/excellent base substrate is the metal pipe, and described metal pipe is circular pipe blank 5, and described circular pipe blank 5 is specially the powder slurry extruding porous stainless steel antipriming pipe of diameter 5mm and length 600mm.Actual when carrying out sintering, selecting an end of described powder slurry extruding porous stainless steel antipriming pipe earlier is suspended end, and adopt rig to get out a hanging hole 3-1 at selected suspended end middle part, described hanging hole 3-1 is that circular hole and its diameter are 2.5mm, and the distance between the center of circle of hanging hole 3-1 and the described suspended end end is 5mm; Afterwards, be that the two ends that will hang silk 2 again is formed by knots tied the hanging ring of a sealing, more horizontal peg 1 is penetrated described hanging ring after passing among the suspension silk 2 peg hole 3-1 of 2mm with diameter; Subsequently, mention horizontal peg 1 again and be fixed on the burning boat that is laid in the high temperature sintering furnace, then finish the vertical hanging process of powder slurry extruding porous stainless steel antipriming pipe together with powder slurry extruding porous stainless steel antipriming pipe.In the present embodiment, described suspension silk 2 is the heating resisting metal silk, and described high temperature sintering furnace is a hydrogen furnace.Treat with powder slurry extruding porous stainless steel antipriming pipe vertical hanging good after, then open hydrogen furnace the powder slurry extruding porous stainless steel antipriming pipe of vertical hanging on horizontal peg 1 carried out high temperature sintering, in the high-temperature sintering process, powder slurry extruding porous stainless steel antipriming pipe is hung vertically in described hydrogen furnace inside all the time, in the present embodiment, when carrying out high temperature sintering, programming rate is 8 ℃/min, sintering temperature is that 1250 ℃ and temperature retention time are 2h, and the stainless steel antipriming pipe that is obtained behind the sintering can find out obviously that gloss is good and body is very vertical.
Actual when carrying out vertical sintering, described hanging hole 3-1 also can be the through hole of other shape, mainly guarantee to hang to pass among the silk 2 energy peg hole 3-1 and get final product, and the distance between described hanging hole 3-1 and the described suspended end end is difficult for long, particularly, the distance between the center of described hanging hole 3-1 and the described suspended end end is 2mm～10mm.During actual suspension, also can select for use other suspended end of circular pipe blank 5 can be fixedly secured fixed form on horizontal peg 1, the suspended end that only need guarantee circular pipe blank 5 can fixedly secure in high-temperature sintering process all the time on horizontal peg 1 and its other end is a free end, in the whole high-temperature sintering process, circular pipe blank 5 is the vertical hanging state all the time.Simultaneously, adopt the present invention also can carry out vertical sintering to the metal pipe of other shape, and the vertical hanging method is identical with vertical hanging method in the present embodiment, can adopt in the suspended end of described metal pipe and open hanging hole 3-1 or hanging groove 3-2 method hangs, and guarantee that described metal pipe is hung vertically on the horizontal peg 1 all the time after hanging.In addition, the suspension silk 2 that is adopted also can be the heating resisting metal silk of cross section for other shapes such as oval, square, pentagon, triangle, hexagons.
As shown in Figure 2, in the present embodiment, as different from Example 1: slender powder metallurgy tube pipe to be sintered/excellent base substrate is a circular pipe blank 5, and described circular pipe blank 5 is the powder slurry extruding nickel porous pipe of 5mm and length 600mm for diameter.Actual when carrying out sintering, selecting an end of described powder slurry extruding nickel porous pipe earlier is suspended end, and adopt rig to get out a hanging hole 3-1 at selected suspended end middle part, described hanging hole 3-1 is that circular hole and its diameter are 2.5mm, and the distance between the center of circle of hanging hole 3-1 and the described suspended end end is 5mm; Afterwards, be that the two ends that will hang silk 2 again is formed by knots tied the hanging ring of a sealing, more horizontal peg 1 is penetrated described hanging ring after passing among the suspension silk 2 peg hole 3-1 of 2mm with diameter; Subsequently, mention horizontal peg 1 again and be fixed on the bin 4 that is laid in the high temperature sintering furnace, then finish the vertical hanging process of powder slurry extruding nickel porous pipe together with powder slurry extruding nickel porous pipe.In the present embodiment, described suspension silk 2 is the heating resisting metal silk, and described high temperature sintering furnace is a hydrogen furnace.With powder slurry extruding nickel porous pipe vertical hanging good after, then open hydrogen furnace the powder slurry extruding nickel porous pipe of vertical hanging on horizontal peg 1 carried out high temperature sintering, in the high-temperature sintering process, powder slurry extruding nickel porous pipe is hung vertically in described hydrogen furnace inside all the time, in the present embodiment, when carrying out high temperature sintering, sintering temperature is that 1200 ℃ and temperature retention time are 2h, and the nickel porous pipe that is obtained behind the sintering can find out obviously that gloss is good and body is very vertical.
Embodiment 3
In the present embodiment, as different from Example 1: slender powder metallurgy tube pipe to be sintered/excellent base substrate is that metal bar base and described metal bar base are that cross section is square square rod base, and it is that 6mm * 8mm and length are the powder compaction titanium rod of 300mm that described square rod base is specially cross sectional dimensions.Actual when carrying out sintering, selecting an end of described powder compaction titanium rod earlier is suspended end, and adopt drilling machine to get out a hanging hole 3-1 at selected suspended end middle part, and described hanging hole 3-1 is that circular hole and its diameter are 3mm, the distance between the center of circle of hanging hole 3-1 and the described suspended end end is 5mm; Afterwards, be that the two ends that will hang silk 2 again is formed by knots tied the hanging ring of a sealing, more horizontal peg 1 is penetrated described hanging ring after passing among the suspension silk 2 peg hole 3-1 of 2mm with diameter; Subsequently, mention horizontal peg 1 again and be fixed in the bin 4 that is laid in the high temperature sintering furnace, then finish the vertical hanging process of powder compaction titanium rod together with powder compaction titanium rod.In the present embodiment, described suspension silk 2 is the heating resisting metal silk, and described high temperature sintering furnace is a vacuum heat treatment furnace, and described bin 4 is a cage shape bin.With powder compaction titanium rod vertical hanging good after, then open vacuum heat treatment furnace the powder compaction titanium rod of vertical hanging on horizontal peg 1 carried out high temperature sintering, in the high-temperature sintering process, powder compaction titanium rod is hung vertically in described vacuum heat furnace interior all the time, in the present embodiment, when carrying out high temperature sintering, sintering temperature is that 800 ℃-950 ℃ and temperature retention time are 2h, the titanium rod lustrous surface that is obtained behind the sintering is good, does not have stain and titanium rod very vertical.
Actual when carrying out vertical sintering, adopt the present invention also can carry out vertical sintering processes for the metal bar base that circular pole base 6 or cross section are other shapes such as square, rectangle, pentagon, hexagon, ellipse, triangle to cross section, and the vertical hanging method is identical with vertical hanging method in the present embodiment, can adopt in the suspended end of described metal bar base and open hanging hole 3-1 or hanging groove 3-2 method hangs, and guarantee that described metal bar base is hung vertically on the horizontal peg 1 all the time after hanging.
As shown in Figure 3, in the present embodiment, as different from Example 1: slender powder metallurgy tube pipe to be sintered/excellent base substrate is that metal bar base and described metal bar base are that cross section is square square rod base 6, and it is that 8mm * 12mm and length are the powder compaction molybdenum bar of 200mm that described pole base 6 is specially cross sectional dimensions.Actual when carrying out sintering, selecting an end of described powder compaction molybdenum bar earlier is suspended end, and adopt the selected suspended end of file middle part to open a hanging groove 3-2, described hanging groove 3-2 is that square groove and described square groove are of a size of 2mm * 2mm, and the distance between the central axis of described square groove and the described suspended end end is 4mm; Afterwards, be after the suspension silk 2 of 1.5mm passes in hanging groove 3-2 with diameter, the two ends that will hang silk 2 again is formed by knots tied the hanging ring of a sealing, more horizontal peg 1 is penetrated described hanging ring; Subsequently, mention horizontal peg 1 again and be fixed in the frame shape material boat that is laid in the high temperature sintering furnace, then finish the vertical hanging process of powder compaction molybdenum bar together with the powder compaction molybdenum bar.In the present embodiment, described suspension silk 2 is a tungsten filament, and described high temperature sintering furnace is the hydrogen atmosphere stove, and the material of described shape material boat is a tungsten.With powder compaction molybdenum bar vertical hanging good after, then open the hydrogen atmosphere stove powder compaction molybdenum bar of vertical hanging on horizontal peg 1 carried out high temperature sintering, in the high-temperature sintering process, the powder compaction molybdenum bar is hung vertically in described hydrogen atmosphere furnace interior all the time, in the present embodiment, when carrying out high temperature sintering, sintering temperature is that 1650 ℃-2000 ℃ and temperature retention time are 3h, the molybdenum bar lustrous surface that is obtained behind the sintering is good, there are not stain and titanium rod very vertical, omit the incipient fusion sintering process simultaneously, improved production efficiency.
In the present embodiment, as different from Example 1: adopting rig is that circular hole and its diameter are 1mm at the hanging hole 3-1 that selected suspended end middle part gets out, and the distance between the center of circle of hanging hole 3-1 and the described suspended end end is 2mm; Afterwards, be that the two ends that will hang silk 2 again is formed by knots tied the hanging ring of a sealing, more horizontal peg 1 is penetrated described hanging ring after passing among the suspension silk 2 peg hole 3-1 of 0.9mm with diameter.In the present embodiment, all the other steps are all identical with embodiment 1.
In the present embodiment, as different from Example 1: described circular pipe blank 5 is the powder slurry extruding nickel porous pipe of 6mm and length 650mm for diameter; The employing rig is 2mm at the diameter of the hanging hole 3-1 that selected suspended end middle part gets out, and the distance between the center of circle of hanging hole 3-1 and the described suspended end end is 4mm; Afterwards, be that the two ends that will hang silk 2 again is formed by knots tied the hanging ring of a sealing, more horizontal peg 1 is penetrated described hanging ring after passing among the suspension silk 2 peg hole 3-1 of 3mm with diameter.In the present embodiment, all the other steps are all identical with embodiment 1.
Embodiment 7
In the present embodiment, as different from Example 1: described circular pipe blank 5 is the powder slurry extruding nickel porous pipe of 8mm and length 900mm for diameter; The employing rig is 2mm at the diameter of the hanging hole 3-1 that selected suspended end middle part gets out, and the distance between the center of circle of hanging hole 3-1 and the described suspended end end is 6mm; Afterwards, be that the two ends that will hang silk 2 again is formed by knots tied the hanging ring of a sealing, more horizontal peg 1 is penetrated described hanging ring after passing among the suspension silk 2 peg hole 3-1 of 1.8mm with diameter.In the present embodiment, all the other steps are all identical with embodiment 1.
Embodiment 8
In the present embodiment, as different from Example 1: described circular pipe blank 5 is the powder slurry extruding nickel porous pipe of 10mm and length 1100mm for diameter; The employing rig is 4mm at the diameter of the hanging hole 3-1 that selected suspended end middle part gets out, and the distance between the center of circle of hanging hole 3-1 and the described suspended end end is 8mm; Afterwards, be that the two ends that will hang silk 2 again is formed by knots tied the hanging ring of a sealing, more horizontal peg 1 is penetrated described hanging ring after passing among the suspension silk 2 peg hole 3-1 of 3mm with diameter.In the present embodiment, all the other steps are all identical with embodiment 1.
Embodiment 9
In the present embodiment, as different from Example 1: described circular pipe blank 5 is the powder slurry extruding nickel porous pipe of 10mm and length 1100mm for diameter; The employing rig is 3mm at the diameter of the hanging hole 3-1 that selected suspended end middle part gets out, and the distance between the center of circle of hanging hole 3-1 and the described suspended end end is 10mm; Afterwards, be that the two ends that will hang silk 2 again is formed by knots tied the hanging ring of a sealing, more horizontal peg 1 is penetrated described hanging ring after passing among the suspension silk 2 peg hole 3-1 of 2.5mm with diameter.In the present embodiment, all the other steps are all identical with embodiment 1.
Embodiment 10
In the present embodiment, as different from Example 1: will hang after silk 2 two ends is formed by knots tied the hanging ring of a sealing, and again horizontal fixed will be installed in the horizontal peg of laying in the high temperature sintering furnace on the horizontal support bar 1 and penetrate described hanging ring; Subsequently, mention horizontal peg 1 again and be fixed on the horizontal support bar that is laid in the high temperature sintering furnace together with circular pipe blank 5, then finish the vertical hanging process of powder slurry extruding nickel porous pipe, described support bar is made by the high temperature alloy of the high temperature sintering temperature in the described high temperature sintering furnace of ability.In the present embodiment, all the other steps are all identical with embodiment 1.
Embodiment 11
In the present embodiment, as different from Example 4: adopt file to open a hanging groove 3-2 at selected suspended end middle part, described hanging groove 3-2 is that square groove and described square groove are of a size of 3.6mm * 3.6mm, and the distance between the central axis of described square groove and the described suspended end end is 8mm; Afterwards, be after the suspension silk 2 of 3mm passes in hanging groove 3-2 with diameter, the two ends that will hang silk 2 again is formed by knots tied the hanging ring of a sealing, more horizontal peg 1 is penetrated described hanging ring.In the present embodiment, all the other steps are all identical with embodiment 4.Simultaneously, when opening hanging groove 3-2, can also adopt the machinery tools fluting at the suspended end middle part.
Embodiment 12
In the present embodiment, as different from Example 4: adopt file to open a hanging groove 3-2 at selected suspended end middle part, described hanging groove 3-2 is that square groove and described square groove are of a size of 2.8mm * 2.8mm, and the distance between the central axis of described square groove and the described suspended end end is 6mm; Afterwards, be after the suspension silk 2 of 2.5mm passes in hanging groove 3-2 with diameter, the two ends that will hang silk 2 again is formed by knots tied the hanging ring of a sealing, more horizontal peg 1 is penetrated described hanging ring.In the present embodiment, all the other steps are all identical with embodiment 4.
Embodiment 13
In the present embodiment, as different from Example 4: adopt file to open a hanging groove 3-2 at selected suspended end middle part, described hanging groove 3-2 is that square groove and described square groove are of a size of 2.2mm * 2.2mm, and the distance between the central axis of described square groove and the described suspended end end is 4mm; Afterwards, be after the suspension silk 2 of 2mm passes in hanging groove 3-2 with diameter, the two ends that will hang silk 2 again is formed by knots tied the hanging ring of a sealing, more horizontal peg 1 is penetrated described hanging ring.In the present embodiment, all the other steps are all identical with embodiment 4.
Embodiment 14
In the present embodiment, as different from Example 4: adopt file to open a hanging groove 3-2 at selected suspended end middle part, described hanging groove 3-2 is that square groove and described square groove are of a size of 1.9mm * 1.9mm, and the distance between the central axis of described square groove and the described suspended end end is 2mm; Afterwards, be after the suspension silk 2 of 1.8mm passes in hanging groove 3-2 with diameter, the two ends that will hang silk 2 again is formed by knots tied the hanging ring of a sealing, more horizontal peg 1 is penetrated described hanging ring.In the present embodiment, all the other steps are all identical with embodiment 4.
The above; it only is preferred embodiment of the present invention; be not that the present invention is imposed any restrictions, everyly any simple modification that above embodiment did, change and equivalent structure changed, all still belong in the protection domain of technical solution of the present invention according to the technology of the present invention essence.
Claims (7)
1. the suspension sintering method of slender powder metallurgy tube pipe/excellent base substrate is characterized in that this method may further comprise the steps:
Step 1, vertical hanging: the end suspension of slender powder metallurgy tube pipe to be sintered/excellent base substrate is fixed on the fixed support structure that is laid in the high temperature sintering furnace, and make slender powder metallurgy tube pipe to be sintered/excellent base substrate under the self gravitation effect, be hung vertically on the described fixed support structure; Described slender powder metallurgy tube pipe to be sintered/excellent base substrate for through length that the powder metallurgy forming processes forms greater than 100mm, external diameter or equivalent diameter less than 30mm and long outer metal pipe or the metal bar base that compares greater than 10; Slender powder metallurgy tube pipe to be sintered/excellent base substrate hangs an end that is fixed on the described fixed support structure and is its suspended end;
Step 2, high temperature sintering: adopt described high temperature sintering furnace that the to be sintered slender powder metallurgy tube pipe/excellent base substrate of vertical hanging on described fixed support structure carried out 800 ℃ of-2000 ℃ of high temperature sinterings; In the high-temperature sintering process, slender powder metallurgy tube pipe to be sintered/excellent base substrate is hung vertically in described high temperature sintering furnace interior all the time.
2. according to the suspension sintering method of the described a kind of slender powder metallurgy tube pipe of claim 1/excellent base substrate, it is characterized in that: the suspended end of the described slender powder metallurgy tube pipe to be sintered of step 1/excellent base substrate hangs by the suspension silk (2) made by refractory metal silk material and is fixed on the described fixed support structure, and the described silk (2) that hangs is for adopting the metal wire material of high temperature sintering furnace to the high temperature sintering temperature of slender powder metallurgy tube pipe to be sintered/when excellent base substrate carries out high temperature sintering in the ability step 2; Correspondence is provided with for hanging hanging hole (3-1) or the hanging groove (3-2) that silk (2) hangs on the suspended end of slender powder metallurgy tube pipe to be sintered/excellent base substrate.
3. according to the suspension sintering method of claim 1 or 2 described a kind of slender powder metallurgy tube pipe/excellent base substrates, it is characterized in that: described fixed support structure is for burning boat, bin (4) or being laid in the interior support bar of described high temperature sintering furnace, and described support bar is made by the high temperature alloy of the high temperature sintering temperature in the described high temperature sintering furnace of ability.
4. according to the suspension sintering method of the described a kind of slender powder metallurgy tube pipe of claim 2/excellent base substrate, it is characterized in that: the suspended end with slender powder metallurgy tube pipe to be sintered/excellent base substrate described in the step 1 hangs and is fixed on before the described fixed support structure, carries out earlier perforate or fluting and corresponding formation hanging hole (3-1) or hanging groove (3-2) on described suspended end; And when being fixed on described suspended end suspension on the described fixed support structure, to hang earlier in silk (2) peg hole (3-1) or the hanging groove (3-2) and pass, the two ends that will hang silk (2) again are fixed together and form the hanging ring of a sealing, after afterwards a horizontal peg (1) being passed in described suspension, more horizontal peg (1) is suspended on the described fixed support structure together with the slender powder metallurgy tube pipe to be sintered/excellent base substrate that hangs thereon; Described horizontal peg (1) horizontal fixed is installed on the described fixed support structure.
5. according to the suspension sintering method of the described a kind of slender powder metallurgy tube pipe of claim 2/excellent base substrate, it is characterized in that: described hanging hole (3-1) is a circular hole, the diameter of described circular hole is 1/5～1/2 of slender powder metallurgy tube pipe to be sintered/excellent base substrate external diameter or an equivalent diameter, distance between the center of circle of described circular hole and the described suspended end end is 2mm～10mm, and the diameter of described suspension silk (2) is less than the diameter of described circular hole; Described hanging groove (3-2) is a square groove, the length of side of described square groove is 1/6～1/3 of slender powder metallurgy tube pipe to be sintered/excellent base substrate external diameter or an equivalent diameter, distance between the central axis of described square groove and the described suspended end end is 3mm～8mm, and the diameter of described suspension silk (2) is less than the length of side of described square groove.
6. according to the suspension sintering method of claim 1 or 2 described a kind of slender powder metallurgy tube pipe/excellent base substrates, it is characterized in that: the metal pipe described in the step 1 is circular pipe blank (5).
7. according to the suspension sintering method of claim 1 or 2 described a kind of slender powder metallurgy tube pipe/excellent base substrates, it is characterized in that: the metal bar base described in the step 1 is that cross section is circular or square pole base (6) or square rod base.
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| CN 201010259586 CN101912968A (en) | 2010-08-20 | 2010-08-20 | Suspension sintering method of slender powder metallurgy tube/bar blank |
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| CN 201010259586 CN101912968A (en) | 2010-08-20 | 2010-08-20 | Suspension sintering method of slender powder metallurgy tube/bar blank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111515390A (en) * | 2020-04-17 | 2020-08-11 | 河北宏靶科技有限公司 | Sintering tool for cylindrical target and sintering method thereof |
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